From the book of: "1,000s of great ideas which most likely never reach the build stage" is a 1/72 Monogram A-1E to be rebuilt as the "A-1K Scythe".
The Scythe is an A-1 Gunship. A filler between the AH-1 Cobras and AC-47/AC-119 Spooky/Spectre. Also inspiration from the Super Avenger profiles (IE the turret)
Standard loadout:
2x Suu-16/A 20mm gun pods from the F-4D.
4x Suu-11/A 7.62 guns pods from the AH-1G
4x LAU-10 with 5" Zuni Rockets (yes, I know this was a Navy only weapon but I think it is cool).
4x 20mm wings cannons
1 or 2 B-29 .50 Cal turret mounted on the top/bottom in the rear cockpits area for self defence. Operated by the GIBs (guys-in-the-back)
Drop tanks
Painted in SEA Technical Order 1-1-4
With the all the gun pods, you could probably do away with the wing canons.

All those slung weapons pretty much max out the old Spad, leaving no payload capability for a drop tank, so range would be pretty short.
To stay within the 8000 lb payload capability, how about:
2 x 100 gal tank under inner wings
SUU-16 on the centerline station
then the various Zuni and Minigun pods
The rear turrets are out, I'm afraid. Just too heavy.

The Beech Grizzly had the B-29 turret arrangement you suggest, but flew on two of the Skyraider's R-3350 engines.
Just reality poking in it's awkward head. Feel free to ignore at any point.

Paul